#!/usr/bin/env ruby

options = ""
if ARGV.length!=2
  puts "usage: perf_diff_gc file1 file2"
  exit 1
end
files=[]
ARGV.each do |arg|
  fn = arg
  fn = fn.sub(/^\/([cdefgh])(\/)/, '\1:\2') if RUBY_PLATFORM =~ /win32/
  begin
    if File.stat(fn).readable?
      files << File.open(fn)
    else
      print "file #{fn} is unreadable\n"
      exit 1
    end
  rescue 
    print "file #{fn} does not exist\n"
    exit 1
  end
end

require "#{File.dirname(__FILE__)}/../lib/gc_info.rb"

printf "GC data file1: #{File.expand_path(files[0].path)}\n"
printf "GC data file2: #{File.expand_path(files[1].path)}\n\n"

gcis = files.map{|file| GCInfo.new(file)}
files.each{|file| file.close}

printf "number of requests: %d/%d\n", gcis[0].num_requests, gcis[1].num_requests

printf "                         %12s %12s %7s\n", "c1", "c2", "c1/c2"
printf "collections            : %12.2f %12.2f %7.2f\n",
       (n1 = gcis[0].collections),
       (n2 = gcis[1].collections),
       n1.to_f/n2
printf "garbage total          : %12.2f %12.2f %7.2f\n",
       (n1 = gcis[0].garbage_produced),
       (n2 = gcis[1].garbage_produced),
       n1.to_f/n2
printf "gc time total (sec)    : %12.2f %12.2f %7.2f\n",
       (n1 = gcis[0].time_total.to_f/1000),
       (n2 = gcis[1].time_total.to_f/1000),
       n1/n2
printf "garbage per request    : %12.2f %12.2f %7.2f\n",
       (n1 = gcis[0].garbage_produced.to_f/gcis[0].num_requests),
       (n2 = gcis[1].garbage_produced.to_f/gcis[1].num_requests),
       n1/n2
printf "requests per collection: %12.2f %12.2f %7.2f\n",
       (n1 = gcis[0].num_requests.to_f/gcis[0].collections),
       (n2 = gcis[1].num_requests.to_f/gcis[1].collections),
       n1/n2

printf "\n             %12s %12s %9s %9s %9s %9s\n",
       "c1 mean", "c2 mean", "c1 min", "c2 min", "c1 max", "c2 max"

number_format = "%12.2f %12.2f %9d %9d %9d %9d"
  
printf "gc time(ms): #{number_format}\n",
       gcis[0].time_mean, gcis[1].time_mean,
       gcis[0].time_min, gcis[1].time_min,
       gcis[0].time_max, gcis[1].time_max
   
printf "heap slots : #{number_format}\n",
       gcis[0].processed_mean, gcis[1].processed_mean,
       gcis[0].processed_min, gcis[1].processed_min,
       gcis[0].processed_max, gcis[1].processed_max

printf "live       : #{number_format}\n",
       gcis[0].live_mean, gcis[1].live_mean,
       gcis[0].live_min, gcis[1].live_min,
       gcis[0].live_max, gcis[1].live_max
  
printf "freed      : #{number_format}\n",
       gcis[0].freed_mean, gcis[1].freed_mean,
       gcis[0].freed_min, gcis[1].freed_min,
       gcis[0].freed_max, gcis[1].freed_max
  
printf "freelist   : #{number_format}\n",
       gcis[0].freelist_mean, gcis[1].freelist_mean,
       gcis[0].freelist_min, gcis[1].freelist_min,
       gcis[0].freelist_max, gcis[1].freelist_max


__END__

### Local Variables: ***
### mode:ruby ***
### End: ***

#    Copyright (C) 2005, 2006  Stefan Kaes
#
#    This program is free software; you can redistribute it and/or modify
#    it under the terms of the GNU General Public License as published by
#    the Free Software Foundation; either version 2 of the License, or
#    (at your option) any later version.
#
#    This program is distributed in the hope that it will be useful,
#    but WITHOUT ANY WARRANTY; without even the implied warranty of
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#    GNU General Public License for more details.
#
#    You should have received a copy of the GNU General Public License
#    along with this program; if not, write to the Free Software
#    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA